The updated Mazda Demio, introduced in 2002, was built on the DY platform. While the Demio nameplate was retained for the Japanese domestic market, Mazda replaced the “121” model designation in export markets with the simpler “2”. In this article, we provide a detailed overview of the fuse box diagrams and electrical layouts for the second-generation Mazda2 (DY chassis; Ford B3 platform) produced from 2002 through 2007.
Here you will find fuse box locations, photos, and circuit diagrams. Fuses for key components such as the “Cigarette Lighter” and “Fuel Pump” are highlighted in bold.
Engine Compartment Fuse Box
Located under the protective cover adjacent to the battery.
General view.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Rating (A) |
| R1 | Wide Open Throttle (WOT) A/C Cut-off Relay | |
| R2 | Cooling fan motor relay (high speed) | |
| R3 | Cooling fan motor relay (low speed) | |
| F1 | Glow plugs (diesel), auxiliary heater | 50 |
| F2 | A/C and heater blower motor | 40 |
| F3 | Ignition switch | 50 |
| F4 | Cooling fan motor | 50 |
| F5 | Automated manual transmission (AMT) clutch control | 60 |
| F6 | Ignition switch | 60 |
| F7 | Headlamps | 30 |
| F8 | Engine management system (PCM / ECM) | 60 |
| F9 | Main battery power distribution | 100 |
| F10 | Heated rear window (defroster) | 30 |
| F11 | Anti-lock Braking System (ABS) | 60 |
| F12 | Power windows | 20 |
| F13 | Central locking system | 30 |
| F14 | Front fog lamps | 15 |
Passenger Compartment Fuse Boxes
There are three distribution boxes located in the cabin to protect the vehicle's electrical circuits.
Primary Fuse Box
Located beneath the lower dashboard. Remove the protective cover to access.
General view of the primary passenger compartment fuse box (Mazda2 DY).
| Diagram | ||
|---|---|---|
|
||
| No. | Rating (A) | Description |
| F1.01 | - | Not used |
| F1.02 | - | |
| F1.03 | 15 | Interior illumination |
| F1.04 | 15 | Cigarette lighter socket |
| F1.05 | 7.5 | Power exterior mirrors |
| F1.06 | - | Not used |
| F1.07 | 10 | Instrument cluster |
| F1.08 | 20 | Windshield wiper and washer system |
| F1.09 | 10 | Supplemental Restraint System (SRS / Airbag) |
| F1.10 | 15 | Engine management system |
| F1.11 | 15 | Engine Control Module (ECM / PCM) |
| F1.12 | 30 | Power windows |
| F1.13 | - | Not used |
| F1.14 | - | |
| F1.15 | - | |
| F1.16 | 7.5 | Starter control circuit |
| F1.17 | 7.5 | Reverse (backup) lamps |
| F1.18 | 7.5 | Instrument cluster illumination |
| F1.19 | 7.5 | A/C compressor magnetic clutch |
| F1.20 | 7.5 | Air conditioning system |
| F1.21 | 10 | Tailgate window wiper and washer |
| F1.22 | 10 | Heated rear window (defroster) |
| F1.23 | - | Not used |
| F1.24 | - | |
Auxiliary Fuse Box
The auxiliary passenger compartment unit is located behind the glove compartment.
| Diagram | ||
|---|---|---|
|
||
| No. | Rating (A) | Description |
| F2.01 | - | Not used |
| F2.02 | 30 | Anti-lock Braking System (ABS) |
| F2.03 | - | Not used |
| F2.04 | 7.5 | Alternator |
| F2.05 | 20 | Fuel pump fuse |
| F2.06 | 7.5 | Powertrain Control Module (PCM - engine & transmission) |
| F2.07 | 15 | Mass Air Flow (MAF) sensor, engine management |
| F2.08 | 20 | |
| F2.09 | 15 | Brake lamps (stop lights) |
| F2.10 | 15 | Anti-theft alarm system |
| F2.11 | - | Not used |
| F2.12 | - | |
| F2.13 | - | |
| F2.14 | 15 | Tail, Number Plate & Side Lamps (TNS) |
| F2.15 | 20 | Anti-lock Braking System (ABS) |
| F2.16 | 15 | Heated exterior mirrors |
| F2.17 | 10 | High beam headlamp (right) |
| F2.18 | 10 | High beam headlamp (left) |
| F2.19 | 10 | Low beam headlamp (right) |
| F2.20 | 10 | Low beam headlamp (left) |
| F2.21 | - | Not used |
| F2.22 | - | |
| F2.23 | - | |
| F2.24 | - | |
Passenger Compartment Relay Box
Located adjacent to the auxiliary passenger compartment unit.
Relay layout diagram.
| No. | Description |
| 1 | Low beam relay |
| 2 | High beam relay |
| 3 | Fuel pump relay |
| 4 | Anti-theft alarm relay |
| 5 | Engine control (PCM) relay |
General Component Locations
Placement of electronic control units (ECUs) and major electrical components.
|
|
| No. | Description |
| 1 | A/C control module (integrated in heater control panel) |
| 2 | A/C and heater blower motor relay (behind dashboard) |
| 3 | A/C and heater blower motor resistor (passenger footwell) |
| 4 | Front crash sensor (SRS) |
| 5 | Immobilizer control module (behind dashboard) |
| 6 | Anti-theft alarm siren |
| 7 | Battery |
| 8 | Central locking control module |
| 9 | Automated clutch actuator control module (engine compartment) |
| 10 | Data Link Connector (DLC / OBD-II) |
| 11 | Power window switch module (driver door) |
| 12 | Cooling fan motor resistor (on fan shroud) |
| 13 | Front fog lamp relay |
| 14 | Engine compartment fuse/relay box |
| 15 | Passenger compartment fuse box 1 (Primary) |
| 16 | Passenger compartment fuse box 2 (Auxiliary) |
| 17 | Passenger compartment relay box 3 |
| 18 | Headlamp leveling motor (left) |
| 19 | Headlamp leveling motor (right) |
| 20 | Heated rear window relay |
| 21 | Horn |
| 22 | Immobilizer antenna ring (ignition lock cylinder) |
| 23 | Turn signal / hazard flasher relay |
| 24 | Instrument cluster control module (in dashboard) |
| 25 | Rear fog lamp relay |
| 26 | Rear window washer pump (integrated with windshield washer pump) |
| 27 | Multi-relay unit (includes windshield wiper motor, windshield washer pump, rear window washer, horn, and exterior lights relays) |
| 28 | Left front side-impact sensor (lower B-pillar) |
| 29 | Right front side-impact sensor (lower B-pillar) |
| 30 | Starter relay |
| 31 | SRS (airbag) control unit |
| 32 | Transmission Control Module (TCM, integrated in clutch control module) |
| 33 | Gearshift actuator (mounted on transmission) |
| 34 | Gearshift control unit (automatic transmission selector lever) |
| 35 | Vehicle speed sensor (models with ABS - integrated in ABS ECU) |
| 36 | Vehicle speed sensor (models without ABS - mounted on gearbox) |
| 37 | Windshield washer fluid level sensor |
| 38 | Windshield washer pump motor |
| 39 | Intermittent windshield wiper relay (integrated in switch assembly) |